From d9e8b9469f79b4ac6cb59adffc4436be0827f262 Mon Sep 17 00:00:00 2001
From: Zsolt Parragi <zsolt.parragi@percona.com>
Date: Tue, 30 Apr 2019 12:27:36 -0700
Subject: [PATCH] FB8-120: Added db_metadata options to create database command
 (#972)

Summary:
JIRA ticket: https://jira.percona.com/browse/FB8-120

Reference commit: https://github.com/facebook/mysql-5.6/commit/2f08e3a
Reference commit: https://github.com/facebook/mysql-5.6/commit/a21e84f
Reference commit: https://github.com/facebook/mysql-5.6/commit/5983ba3181a
Reference commit: https://github.com/facebook/mysql-5.6/commit/414870abeee

Added new option db_metadata to the create database
`CREATE DATABASE [IF NOT EXISTS] db_name DB_METADATA [=] metadata`

The new option is stored in the db.opt file along with other database options like charset and read_only.
The options accepts any string value. If not specified, it writes empty string as the default value in the db.opt file.
To retrieve the option value for a particular database, the show command can be used as follows:
`SHOW CREATE DATABASE db_name`

Example Usage:

create database test2 charset utf8 read_only = true db_metadata '{\'shard_name\':\'myshard_for_test2\'}';
show create database test2;

Output:

+----------+--------------------------------------------------------------------------------------------------------------------------+
| Database | Create Database                                                                                                          |
+----------+--------------------------------------------------------------------------------------------------------------------------+
| test2    | CREATE DATABASE `test2` /*!40100 DEFAULT CHARACTER SET utf8 READ_ONLY DB_METADATA {'shard_name':'myshard_for_test2'} */  |
+----------+--------------------------------------------------------------------------------------------------------------------------+

Pull Request resolved: https://github.com/facebook/mysql-5.6/pull/972

Reviewed By: yizhang82

Differential Revision: D14883632

Pulled By: yizhang82

fbshipit-source-id: 84fda3f8af2
---
 mysql-test/r/db_metadata.result               | 157 +++++++++++++++++
 .../r/information_schema_keywords.result      |   1 +
 mysql-test/t/db_metadata.test                 | 159 ++++++++++++++++++
 share/messages_to_clients.txt                 |  12 +-
 sql/dd/dd_schema.cc                           |   4 +-
 sql/dd/dd_schema.h                            |   2 +-
 sql/dd/impl/types/schema_impl.cc              |  23 +++
 sql/dd/impl/types/schema_impl.h               |  21 ++-
 sql/dd/types/schema.h                         |   3 +
 sql/dd/upgrade_57/schema.cc                   |   2 +-
 sql/handler.h                                 |   4 +-
 sql/lex.h                                     |   1 +
 sql/sql_const.h                               |   3 +
 sql/sql_db.cc                                 |   6 +-
 sql/sql_show.cc                               |   9 +
 sql/sql_yacc.yy                               |  37 +++-
 16 files changed, 423 insertions(+), 21 deletions(-)
 create mode 100644 mysql-test/r/db_metadata.result
 create mode 100644 mysql-test/t/db_metadata.test

diff --git a/mysql-test/r/db_metadata.result b/mysql-test/r/db_metadata.result
new file mode 100644
index 000000000000..6d4cf562d95c
--- /dev/null
+++ b/mysql-test/r/db_metadata.result
@@ -0,0 +1,157 @@
+create database test2;
+show create database test2;
+Database	Create Database
+test2	CREATE DATABASE `test2` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test3 character set utf8;
+Warnings:
+Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
+show create database test3;
+Database	Create Database
+test3	CREATE DATABASE `test3` /*!40100 DEFAULT CHARACTER SET utf8 */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test4 read_only = true;
+show create database test4;
+Database	Create Database
+test4	CREATE DATABASE `test4` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test5 db_metadata = "{\"shard\":\"test5_shard\"}";
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"shard":"test5_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+drop database test5;
+CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"shard":"test5_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */;
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"shard":"test5_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test6 character set utf8 db_metadata = "{\"shard\":\"test6_shard\"}";
+Warnings:
+Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
+show create database test6;
+Database	Create Database
+test6	CREATE DATABASE `test6` /*!40100 DEFAULT CHARACTER SET utf8 DB_METADATA '{"shard":"test6_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test7 read_only = true db_metadata = "{\"shard\":\"test7_shard\"}";
+show create database test7;
+Database	Create Database
+test7	CREATE DATABASE `test7` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"shard":"test7_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test8 character set utf8 read_only = true;
+Warnings:
+Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
+show create database test8;
+Database	Create Database
+test8	CREATE DATABASE `test8` /*!40100 DEFAULT CHARACTER SET utf8 */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test9 character set utf8 read_only = true db_metadata = "{\"shard\":\"test9_shard\"}";
+Warnings:
+Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
+show create database test9;
+Database	Create Database
+test9	CREATE DATABASE `test9` /*!40100 DEFAULT CHARACTER SET utf8 DB_METADATA '{"shard":"test9_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test3 character set ascii;
+show create database test3;
+Database	Create Database
+test3	CREATE DATABASE `test3` /*!40100 DEFAULT CHARACTER SET ascii */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test4 read_only = true;
+show create database test4;
+Database	Create Database
+test4	CREATE DATABASE `test4` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci READ_ONLY */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 db_metadata = "{\"shard\":\"test5_shard_altered\"}";
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"shard":"test5_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 character set ascii;
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET ascii DB_METADATA '{"shard":"test5_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 read_only = true;
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET ascii READ_ONLY DB_METADATA '{"shard":"test5_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 character set utf8 read_only = false;
+Warnings:
+Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8 DB_METADATA '{"shard":"test5_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 db_metadata "";
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8 */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 db_metadata "{\"shard\":\"Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Fin\"}";
+show create database test5;
+Database	Create Database
+test5	CREATE DATABASE `test5` /*!40100 DEFAULT CHARACTER SET utf8 DB_METADATA '{"shard":"Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Fin"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test5 db_metadata "{\"shard\":\"Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Fin\"}";;
+ERROR HY000: Metadata for the database is too long. Max length is 1024 bytes
+alter database test6 character set ascii db_metadata = "{\"shard\":\"test6_shard_altered\"}";
+show create database test6;
+Database	Create Database
+test6	CREATE DATABASE `test6` /*!40100 DEFAULT CHARACTER SET ascii DB_METADATA '{"shard":"test6_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test7 read_only = true db_metadata = "{\"shard\":\"test7_shard_altered\"}";
+show create database test7;
+Database	Create Database
+test7	CREATE DATABASE `test7` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci READ_ONLY DB_METADATA '{"shard":"test7_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test8 character set ascii read_only = true;
+show create database test8;
+Database	Create Database
+test8	CREATE DATABASE `test8` /*!40100 DEFAULT CHARACTER SET ascii READ_ONLY */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test9 character set ascii read_only = true db_metadata = "{\"shard\":\"test9_shard_altered\"}";
+show create database test9;
+Database	Create Database
+test9	CREATE DATABASE `test9` /*!40100 DEFAULT CHARACTER SET ascii READ_ONLY DB_METADATA '{"shard":"test9_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+show create database information_schema;
+Database	Create Database
+information_schema	CREATE DATABASE `information_schema` /*!40100 DEFAULT CHARACTER SET utf8 */ /*!80016 DEFAULT ENCRYPTION='N' */
+show create database mysql;
+Database	Create Database
+mysql	CREATE DATABASE `mysql` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database information_schema db_metadata "{\"shard\":\"is_shard\"}";
+ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
+alter database test9 db_metadata = "invalid_json";
+ERROR HY000: Invalid JSON for DB_METADATA attribute: invalid_json.
+show create database test9;
+Database	Create Database
+test9	CREATE DATABASE `test9` /*!40100 DEFAULT CHARACTER SET ascii READ_ONLY DB_METADATA '{"shard":"test9_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test10;
+show create database test10;
+Database	Create Database
+test10	CREATE DATABASE `test10` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test10 read_only = true;
+show create database test10;
+Database	Create Database
+test10	CREATE DATABASE `test10` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci READ_ONLY */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test10 db_metadata = "{\"shard\":\"test10_shard_altered\"}";
+show create database test10;
+Database	Create Database
+test10	CREATE DATABASE `test10` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci READ_ONLY DB_METADATA '{"shard":"test10_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+alter database test10 read_only = false;
+show create database test10;
+Database	Create Database
+test10	CREATE DATABASE `test10` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"shard":"test10_shard_altered"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test11 db_metadata = "{\'shard\':\'test11_shard\'}";
+ERROR HY000: Invalid JSON for DB_METADATA attribute: {'shard':'test11_shard'}.
+create database test12 db_metadata = "{\"sha'rd\":\"test12\\\"_shard\"}";
+show create database test12;
+Database	Create Database
+test12	CREATE DATABASE `test12` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"sha''rd":"test12\\"_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+drop database test12;
+CREATE DATABASE `test12` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"sha''rd":"test12\\"_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */;
+show create database test12;
+Database	Create Database
+test12	CREATE DATABASE `test12` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"sha''rd":"test12\\"_shard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+create database test13 db_metadata = '{"sha\'\\"rd":"test13\'_sh\\"ard"}';
+show create database test13;
+Database	Create Database
+test13	CREATE DATABASE `test13` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"sha''\\"rd":"test13''_sh\\"ard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+drop database test13;
+CREATE DATABASE `test13` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"sha''\\"rd":"test13''_sh\\"ard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */;
+show create database test13;
+Database	Create Database
+test13	CREATE DATABASE `test13` /*!40100 DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DB_METADATA '{"sha''\\"rd":"test13''_sh\\"ard"}' */ /*!80016 DEFAULT ENCRYPTION='N' */
+drop database test2;
+drop database test3;
+drop database test4;
+drop database test5;
+drop database test6;
+drop database test7;
+drop database test8;
+drop database test9;
+drop database test10;
+drop database test12;
+drop database test13;
diff --git a/mysql-test/r/information_schema_keywords.result b/mysql-test/r/information_schema_keywords.result
index 02ad95c48b9d..d8ea9163a39d 100644
--- a/mysql-test/r/information_schema_keywords.result
+++ b/mysql-test/r/information_schema_keywords.result
@@ -117,6 +117,7 @@ DAY_HOUR	1
 DAY_MICROSECOND	1
 DAY_MINUTE	1
 DAY_SECOND	1
+DB_METADATA	0
 DEALLOCATE	0
 DEC	1
 DECIMAL	1
diff --git a/mysql-test/t/db_metadata.test b/mysql-test/t/db_metadata.test
new file mode 100644
index 000000000000..ae1850b4adea
--- /dev/null
+++ b/mysql-test/t/db_metadata.test
@@ -0,0 +1,159 @@
+# Test per-database database-metadata attribute
+
+let $MYSQLD_DATADIR= `select @@datadir`;
+
+# create database without any options
+create database test2;
+show create database test2;
+
+# create database with character set
+create database test3 character set utf8;
+show create database test3;
+
+# create database with read only
+create database test4 read_only = true;
+show create database test4;
+
+# create database with db metadata
+create database test5 db_metadata = "{\"shard\":\"test5_shard\"}";
+show create database test5;
+
+# verify show create is valid
+--let $db_create=query_get_value(show create database test5, 'Create Database', 1)
+drop database test5;
+eval $db_create;
+show create database test5;
+
+# create database with character set and db metadata
+create database test6 character set utf8 db_metadata = "{\"shard\":\"test6_shard\"}";
+show create database test6;
+
+# create database with read only and db metadata
+create database test7 read_only = true db_metadata = "{\"shard\":\"test7_shard\"}";
+show create database test7;
+
+# create database with character set and read only
+create database test8 character set utf8 read_only = true;
+show create database test8;
+
+# create database with character set, read only and db metadata
+create database test9 character set utf8 read_only = true db_metadata = "{\"shard\":\"test9_shard\"}";
+show create database test9;
+
+# alter database tests
+
+# alter database character set
+alter database test3 character set ascii;
+show create database test3;
+
+# alter database read only
+alter database test4 read_only = true;
+show create database test4;
+
+# alter database db metadata
+alter database test5 db_metadata = "{\"shard\":\"test5_shard_altered\"}";
+show create database test5;
+
+# alter database character set but keep db metadata intact
+alter database test5 character set ascii;
+show create database test5;
+
+# alter database read only but keep db metadata intact
+alter database test5 read_only = true;
+show create database test5;
+
+# alter database character set and read only but keep db metadata intact
+alter database test5 character set utf8 read_only = false;
+show create database test5;
+
+# alter database reset db metadata
+alter database test5 db_metadata "";
+show create database test5;
+
+# alter database set db metadata to max length string
+alter database test5 db_metadata "{\"shard\":\"Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Fin\"}";
+show create database test5;
+
+# alter database exceed db metadata max length
+--error ER_DB_METADATA_TOO_LONG
+--eval alter database test5 db_metadata \"{\\\"shard\\\":\\\"Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Really long shard name. Fin\\\"}\";
+
+# alter database character set and db metadata
+alter database test6 character set ascii db_metadata = "{\"shard\":\"test6_shard_altered\"}";
+show create database test6;
+
+# alter database read only and db metadata
+alter database test7 read_only = true db_metadata = "{\"shard\":\"test7_shard_altered\"}";
+show create database test7;
+
+# alter database character set and read only
+alter database test8 character set ascii read_only = true;
+show create database test8;
+
+# alter database character set, read only and db metadata
+alter database test9 character set ascii read_only = true db_metadata = "{\"shard\":\"test9_shard_altered\"}";
+show create database test9;
+
+# ensure information_schema and mysql tables are intact
+show create database information_schema;
+show create database mysql;
+
+--error ER_DBACCESS_DENIED_ERROR
+alter database information_schema db_metadata "{\"shard\":\"is_shard\"}";
+
+# alter database with invalid JSON string for db_metadata
+ --error ER_DB_METADATA_INVALID_JSON
+alter database test9 db_metadata = "invalid_json";
+show create database test9;
+
+
+
+# create database without any options
+create database test10;
+show create database test10;
+
+# alter database read only
+alter database test10 read_only = true;
+show create database test10;
+
+# alter database db metadata
+alter database test10 db_metadata = "{\"shard\":\"test10_shard_altered\"}";
+show create database test10;
+
+# alter database read only
+alter database test10 read_only = false;
+show create database test10;
+
+# create database with single quotation
+--error ER_DB_METADATA_INVALID_JSON
+create database test11 db_metadata = "{\'shard\':\'test11_shard\'}";
+
+# create database with double quote around metadata with single and double quotes in value
+create database test12 db_metadata = "{\"sha'rd\":\"test12\\\"_shard\"}";
+show create database test12;
+--let $db_create=query_get_value(show create database test12, 'Create Database', 1)
+drop database test12;
+eval $db_create;
+show create database test12;
+
+# create database with single quote around metadata with single and double quotes in value
+create database test13 db_metadata = '{"sha\'\\"rd":"test13\'_sh\\"ard"}';
+show create database test13;
+--let $db_create=query_get_value(show create database test13, 'Create Database', 1)
+drop database test13;
+eval $db_create;
+show create database test13;
+
+
+# cleanup
+drop database test2;
+drop database test3;
+drop database test4;
+drop database test5;
+drop database test6;
+drop database test7;
+drop database test8;
+drop database test9;
+drop database test10;
+drop database test12;
+drop database test13;
diff --git a/share/messages_to_clients.txt b/share/messages_to_clients.txt
index 217b385a0c1e..678c3d657e63 100644
--- a/share/messages_to_clients.txt
+++ b/share/messages_to_clients.txt
@@ -9533,14 +9533,14 @@ ER_PLACEHOLDER_50061
 ER_PLACEHOLDER_50062
   eng "Placeholder"
 
-ER_PLACEHOLDER_50063
-  eng "Placeholder"
+ER_DB_METADATA_TOO_LONG
+  eng "Metadata for the database is too long. Max length is %d bytes"
 
-ER_PLACEHOLDER_50064
-  eng "Placeholder"
+ER_DB_METADATA_INVALID_JSON
+  eng "Invalid JSON for DB_METADATA attribute: %s."
 
-ER_PLACEHOLDER_50065
-  eng "Placeholder"
+ER_DB_METADATA_READ_ERROR
+  eng "Error reading db metadata option: '%-.64s'"
 
 ER_PLACEHOLDER_50066
   eng "Placeholder"
diff --git a/sql/dd/dd_schema.cc b/sql/dd/dd_schema.cc
index a32efadf0af1..f77a1c301a41 100644
--- a/sql/dd/dd_schema.cc
+++ b/sql/dd/dd_schema.cc
@@ -59,7 +59,8 @@ bool schema_exists(THD *thd, const char *schema_name, bool *exists) {
 }
 
 bool create_schema(THD *thd, const char *schema_name,
-                   const CHARSET_INFO *charset_info, bool default_encryption) {
+                   const CHARSET_INFO *charset_info, bool default_encryption,
+                   const char *db_metadata) {
   // Create dd::Schema object.
   std::unique_ptr<dd::Schema> schema(dd::create_object<dd::Schema>());
 
@@ -68,6 +69,7 @@ bool create_schema(THD *thd, const char *schema_name,
   DBUG_ASSERT(charset_info);
   schema->set_default_collation_id(charset_info->number);
   schema->set_default_encryption(default_encryption);
+  schema->set_db_metadata(db_metadata != nullptr ? db_metadata : "");
 
   // Get statement start time.
   ulonglong ull_curtime = my_time_t_to_ull_datetime(thd->query_start_in_secs());
diff --git a/sql/dd/dd_schema.h b/sql/dd/dd_schema.h
index ced5ab859d16..76e3757ba3e7 100644
--- a/sql/dd/dd_schema.h
+++ b/sql/dd/dd_schema.h
@@ -47,7 +47,7 @@ bool schema_exists(THD *thd, const char *schema_name, bool *exists);
 /** Create a schema record into dd.schemata. */
 bool create_schema(THD *thd, const char *schema_name,
                    const CHARSET_INFO *charset_info,
-                   const bool default_encryption);
+                   const bool default_encryption, const char *db_metadata);
 
 /**
   Acquire MDL on schema name.
diff --git a/sql/dd/impl/types/schema_impl.cc b/sql/dd/impl/types/schema_impl.cc
index b24c946b1e6d..ebe8156b1e67 100644
--- a/sql/dd/impl/types/schema_impl.cc
+++ b/sql/dd/impl/types/schema_impl.cc
@@ -119,6 +119,29 @@ bool Schema_impl::set_options_raw(const String_type &options_raw) {
   return false;
 }
 
+static constexpr auto db_metadata_key = "db_metadata";
+
+bool Schema_impl::set_db_metadata(const String_type &metadata) {
+  if (metadata.empty()) {
+    if (options().exists(db_metadata_key)) {
+      options().remove(db_metadata_key);
+    }
+  } else {
+    options().set(db_metadata_key, metadata);
+  }
+  return true;
+}
+
+String_type Schema_impl::get_db_metadata() const noexcept {
+  if (options().exists(db_metadata_key)) {
+    bool ret;
+    String_type value;
+    ret = options().get(db_metadata_key, &value);
+    if (!ret) return value;
+  }
+  return "";
+}
+
 ///////////////////////////////////////////////////////////////////////////
 
 bool Schema_impl::restore_attributes(const Raw_record &r) {
diff --git a/sql/dd/impl/types/schema_impl.h b/sql/dd/impl/types/schema_impl.h
index fbf210776fa6..cdff5ff33399 100644
--- a/sql/dd/impl/types/schema_impl.h
+++ b/sql/dd/impl/types/schema_impl.h
@@ -152,6 +152,9 @@ class Schema_impl : public Entity_object_impl, public Schema {
 
   virtual bool set_options_raw(const String_type &options_raw);
 
+  virtual bool set_db_metadata(const String_type &metadata);
+  virtual String_type get_db_metadata() const noexcept;
+
   // Fix "inherits ... via dominance" warnings
   virtual Entity_object_impl *impl() { return Entity_object_impl::impl(); }
   virtual const Entity_object_impl *impl() const {
@@ -182,15 +185,15 @@ class Schema_impl : public Entity_object_impl, public Schema {
  public:
   virtual void debug_print(String_type &outb) const {
     char outbuf[1024];
-    sprintf(outbuf,
-            "SCHEMA OBJECT: id= {OID: %lld}, name= %s, "
-            "collation_id={OID: %lld},"
-            "m_created= %llu, m_last_altered= %llu,"
-            "m_default_encryption= %d, "
-            "se_private_data= %s",
-            id(), name().c_str(), m_default_collation_id, m_created,
-            m_last_altered, static_cast<int>(m_default_encryption),
-            m_se_private_data.raw_string().c_str());
+    snprintf(outbuf, sizeof(outbuf) / sizeof(char),
+             "SCHEMA OBJECT: id= {OID: %lld}, name= %s, "
+             "collation_id={OID: %lld},"
+             "m_created= %llu, m_last_altered= %llu,"
+             "m_default_encryption= %d, "
+             "se_private_data= %s",
+             id(), name().c_str(), m_default_collation_id, m_created,
+             m_last_altered, static_cast<int>(m_default_encryption),
+             m_se_private_data.raw_string().c_str());
     outb = String_type(outbuf);
   }
 
diff --git a/sql/dd/types/schema.h b/sql/dd/types/schema.h
index 979f4440094e..66a729394924 100644
--- a/sql/dd/types/schema.h
+++ b/sql/dd/types/schema.h
@@ -132,6 +132,9 @@ class Schema : virtual public Entity_object {
 
   virtual bool set_options_raw(const String_type &options_raw) = 0;
 
+  virtual bool set_db_metadata(const String_type &metadata) = 0;
+  virtual String_type get_db_metadata() const noexcept = 0;
+
  public:
   virtual Event *create_event(THD *thd) const = 0;
 
diff --git a/sql/dd/upgrade_57/schema.cc b/sql/dd/upgrade_57/schema.cc
index de38e96dd6bf..99ef5e914daa 100644
--- a/sql/dd/upgrade_57/schema.cc
+++ b/sql/dd/upgrade_57/schema.cc
@@ -173,7 +173,7 @@ bool migrate_schema_to_dd(THD *thd, const char *dbname) {
   // Disable autocommit option
   Disable_autocommit_guard autocommit_guard(thd);
 
-  if (dd::create_schema(thd, schema_name, schema_charset, false)) {
+  if (dd::create_schema(thd, schema_name, schema_charset, false, nullptr)) {
     trans_rollback_stmt(thd);
     // Full rollback in case we have THD::transaction_rollback_request.
     trans_rollback(thd);
diff --git a/sql/handler.h b/sql/handler.h
index f80e29a4420f..60ec42f3caa6 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -65,7 +65,8 @@
 #include "sql/sql_const.h"       // SHOW_COMP_OPTION
 #include "sql/sql_list.h"        // SQL_I_List
 #include "sql/sql_plugin_ref.h"  // plugin_ref
-#include "thr_lock.h"            // thr_lock_type
+#include "sql_string.h"
+#include "thr_lock.h"  // thr_lock_type
 #include "typelib.h"
 
 class Alter_info;
@@ -2641,6 +2642,7 @@ struct HA_CREATE_INFO {
   const CHARSET_INFO *table_charset{nullptr};
   const CHARSET_INFO *default_table_charset{nullptr};
   enum enum_db_read_only db_read_only { DB_READ_ONLY_NULL };
+  String db_metadata;
   LEX_STRING connect_string{nullptr, 0};
   const char *password{nullptr};
   const char *tablespace{nullptr};
diff --git a/sql/lex.h b/sql/lex.h
index 3a069fb198f7..7bb23cf7730d 100644
--- a/sql/lex.h
+++ b/sql/lex.h
@@ -187,6 +187,7 @@ static const SYMBOL symbols[] = {
     {SYM("DAY_MICROSECOND", DAY_MICROSECOND_SYM)},
     {SYM("DAY_MINUTE", DAY_MINUTE_SYM)},
     {SYM("DAY_SECOND", DAY_SECOND_SYM)},
+    {SYM("DB_METADATA", DB_METADATA_SYM)},
     {SYM("DEALLOCATE", DEALLOCATE_SYM)},
     {SYM("DEC", DECIMAL_SYM)},
     {SYM("DECIMAL", DECIMAL_SYM)},
diff --git a/sql/sql_const.h b/sql/sql_const.h
index 91cde945b00e..9417c19d9f2c 100644
--- a/sql/sql_const.h
+++ b/sql/sql_const.h
@@ -283,6 +283,9 @@ static const ulong EVENT_DEF_CACHE_MIN = 256;
 */
 #define MAX_TIME_ZONE_NAME_LENGTH (NAME_LEN + 1)
 
+/* Max length for the db-metadata option */
+#define DB_METADATA_MAX_LENGTH 1024
+
 #if defined(_WIN32)
 #define INTERRUPT_PRIOR -2
 #define CONNECT_PRIOR -1
diff --git a/sql/sql_db.cc b/sql/sql_db.cc
index 4c44f254750a..a84d83621097 100644
--- a/sql/sql_db.cc
+++ b/sql/sql_db.cc
@@ -504,7 +504,7 @@ bool mysql_create_db(THD *thd, const char *db, HA_CREATE_INFO *create_info) {
     set_db_default_charset(thd, create_info);
 
     if (dd::create_schema(thd, db, create_info->default_table_charset,
-                          encrypt_schema)) {
+                          encrypt_schema, create_info->db_metadata.ptr())) {
       /*
         We could be here due an deadlock or some error reported
         by DD API framework. We remove the database directory
@@ -605,6 +605,10 @@ bool mysql_alter_db(THD *thd, const char *db, HA_CREATE_INFO *create_info) {
         create_info->default_table_charset->number);
   }
 
+  if (create_info->db_metadata.ptr() != nullptr) {
+    schema->set_db_metadata(create_info->db_metadata.ptr());
+  }
+
   if (create_info->db_read_only != DB_READ_ONLY_NULL) {
     dd::Properties &properties = schema->options();
     properties.set(read_only_options_key,
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 8c3c3c2f67e6..254a3cc396b8 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -686,6 +686,8 @@ bool mysqld_show_create_db(THD *thd, char *dbname,
   }
 
   bool is_encrypted_schema = false;
+  std::string metadata;
+
   if (is_infoschema_db(dbname)) {
     create.default_table_charset = system_charset_info;
   } else {
@@ -707,6 +709,7 @@ bool mysqld_show_create_db(THD *thd, char *dbname,
     }
 
     create.db_read_only = get_db_read_only(*schema);
+    metadata = schema->get_db_metadata().c_str();
 
     if (create.default_table_charset == nullptr)
       create.default_table_charset = thd->collation();
@@ -745,6 +748,12 @@ bool mysqld_show_create_db(THD *thd, char *dbname,
     } else if (create.db_read_only == DB_READ_ONLY_SUPER) {
       buffer.append(STRING_WITH_LEN(" SUPER_READ_ONLY"));
     }
+
+    if (!metadata.empty()) {
+      buffer.append(STRING_WITH_LEN(" DB_METADATA "));
+      append_unescaped(&buffer, metadata.c_str(), metadata.size());
+    }
+
     buffer.append(STRING_WITH_LEN(" */"));
   }
   buffer.append(STRING_WITH_LEN(" /*!80016"));
diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy
index eddcacd0143d..ae4422b0dd0b 100644
--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -46,6 +46,9 @@ Note: YYTHD is passed as an argument to yyparse(), and subsequently to yylex().
 #include <limits>
 #include <type_traits>                       // for std::remove_reference
 #include <utility>
+#include <sstream>
+#include <boost/property_tree/ptree.hpp>
+#include <boost/property_tree/json_parser.hpp>
 
 #include "my_alloc.h"
 #include "my_dbug.h"
@@ -443,7 +446,7 @@ void warn_about_deprecated_binary(THD *thd)
   1. We do not accept any reduce/reduce conflicts
   2. We should not introduce new shift/reduce conflicts any more.
 */
-%expect 65
+%expect 66
 
 /*
    MAINTAINER:
@@ -1283,6 +1286,7 @@ void warn_about_deprecated_binary(THD *thd)
 %token<lexer.keyword> GTID_SYM 1201
 %token<lexer.keyword> GTID_EXECUTED 1202           /* MYSQL */
 %token<lexer.keyword> SUPER_READ_ONLY_SYM 1203     /* MYSQL */
+%token<lexer.keyword> DB_METADATA_SYM 1204
 
 /*
   Resolve column attribute ambiguity -- force precedence of "UNIQUE KEY" against
@@ -6066,6 +6070,7 @@ create_database_option:
         | db_read_only
           {
           }
+        | db_metadata_str {}
         ;
 
 opt_if_not_exists:
@@ -6292,6 +6297,35 @@ read_only_opt:
         | SUPER_READ_ONLY_SYM { $$ = 1; }
         ;
 
+db_metadata_str:
+          DB_METADATA_SYM opt_equal TEXT_STRING_sys
+          {
+            if ($3.length > DB_METADATA_MAX_LENGTH)
+            {
+              my_error(ER_DB_METADATA_TOO_LONG, MYF(0), DB_METADATA_MAX_LENGTH);
+              MYSQL_YYABORT;
+            }
+            /* Verify that a valid JSON is provided */
+            if ($3.length > 0)
+            {
+              boost::property_tree::ptree db_metadata_root;
+              std::istringstream is($3.str);
+              try
+              {
+                boost::property_tree::json_parser::read_json(is,
+                                                             db_metadata_root);
+              }
+              catch (const std::exception&)
+              {
+                my_error(ER_DB_METADATA_INVALID_JSON, MYF(0), $3.str);
+                MYSQL_YYABORT;
+              }
+            }
+            Lex->create_info->db_metadata= String($3.str, $3.length,
+              &my_charset_bin);
+          }
+        ;
+
 boolean_val:
           FALSE_SYM { $$ = 0; }
         | TRUE_SYM { $$ = 1; }
@@ -14358,6 +14392,7 @@ ident_keywords_ambiguous_2_labels:
         | COMMENT_SYM
         | COMMIT_SYM
         | CONTAINS_SYM
+        | DB_METADATA_SYM
         | DEALLOCATE_SYM
         | DO_SYM
         | END